Evidence for a cataclysm ~4.0-3.8 Gy ago
Evidence for a cataclysm ~4.0-3.8 Gy ago
Evidence for a cataclysm ~4.0-3.8 Gy ago
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A LATE HEAVY BOMBARDMENT ?<strong>Evidence</strong> <strong>for</strong> a <strong>cataclysm</strong> <strong>~4.0</strong>-<strong>3.8</strong> <strong>Gy</strong> <strong>ago</strong>:The ages of the rocks collected on the Moon cluster at~3.9-<strong>3.8</strong> <strong>Gy</strong>, and rocks older than 4 <strong>Gy</strong> are extremely rare.Suggests a disastrous sudden and short-lived crateringepisode about 3.9 <strong>Gy</strong> <strong>ago</strong>, which distroyed all primoridalrocks, resetting their ages (Tera et al., 1974)Counter-argument:A very heavy, time declining, bombardment, could producethe same effect (Hartung, 1974; Hartmann, 1975, 1980,Grinspoon, 1989)
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